Sri Aurobindo
Letters of Sri Aurobindo
Volume III - Part 3
Fragment ID: 12834
The medium trance is of a different kind – they get not into touch with Sachchidananda but with the beings of the lower vital plane. To develop the power of going into this higher kind of trance, one must have done some sadhana. As to purification, entire purification is not necessary, but some part of the being must have turned to higher things.